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I Can we lift water more than 10.3m using atmosphere pressure?

  1. Jun 9, 2016 #1
    I'm trying to design a solar heated (non electrical pump) ..but by theory when we are lifting water by using vaccum and atmospheric pressure the weight of water after rising 10.3 m is equal to the atmospheric pressure created by vaccum ,so they cancel out..so is it impossible to lift water using vaccum and atmospheric pressure ? I'm posting the design of my Solar heated pump soon
     
  2. jcsd
  3. Jun 9, 2016 #2
  4. Jun 9, 2016 #3
    It will be lifted higher if the water is coming from a confined overpressured aquifer.
     
  5. Jun 9, 2016 #4

    jbriggs444

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    I see one key problem with the drawing. You show water flowing into the tank at the same time that air is flowing out of the tank. Either one is possible separately. But both at the same time is not possible as drawn.
     
  6. Jun 9, 2016 #5

    davenn

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    Agreed, I envision that it would have to be valved. During the day the sun heats the tank and the air is expelled ( to don't see the purpose of it going into the aquifer ?? ) and a valve stops the air going out the water inlet pipe
    At nite, the tank cools and the air outlet valve closes and water is drawn up into the tank by the lower pressure through the water inlet pipe and it's now open valve


    I do doubt that the pressure difference created in the tank would be enough to draw water up any great height


    Dave
     
  7. Jun 9, 2016 #6

    jbriggs444

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    Agreed. One would have to have very hot water for the vapor pressure to amount to a significant fraction of atmospheric pressure. Boiling water could get you just about 10 meters.

    A staged design would be technically possible, though likely impractical. There are more efficient ways to harvest solar power to pump water.
     
  8. Jun 10, 2016 #7
    Wasn't there a purely fluidic Stirling Cycle water pump, which slowly 'sloshed' ?? Several of these, staged, might work, albeit at very low efficiency.

    And don't forget the old-style 'homestead' hydraulic jack ( Not the truck-lifter type !!) which discarded most of a piped water flow diverted from a stream to pump the rest uphill...
     
  9. Jun 11, 2016 #8
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